Phase-locked loop having a switched lowpass filter

Details Phase-locked loop having a switched lowpass filter Phase-locked loop having a switched lowpass filter

1976-01-19

1977-02-08

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, H03B 304

Patent

active

040074293

ABSTRACT:
A phase-locked loop is disclosed having a phase comparator, a switched lowpass filter, a voltage controlled oscillator, a loss of lock detector, and a charging circuit. The switched lowpass filter has two different bandwidths: the first bandwidth has a wide frequency response for use during acquisition periods for rapid acquisition, and a second bandwidth has a very narrow bandwidth for use during normal tracking for tight control of the voltage controlled oscillator. A loss of lock detector controls the particular filter bandwidth state by causing certain filter components to be switched in and out according to the presence or absence of phase lock condition. A charging circuit, used in conjunction with the particular lowpass filter section not operative during acquisition, charges the energy storage components used in this section of the filter to preclude transients from occurring when these components are switched back into the lowpass filter.

REFERENCES:
patent: 3447084 (1969-05-01), Haner et al.
patent: 3909735 (1975-09-01), Anderson et al.

Affiliated with

Also associated with

Rating

Phase-locked loop having a switched lowpass filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Phase-locked loop having a switched lowpass filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase-locked loop having a switched lowpass filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1215549